在ASP.NET中，用于处理的请求，需要封装为HttpWorkerRequest类型的对象。该类为抽象类，定义在命名空间System.Web下。
#region Assembly System.Web.dll, v4.0.0.0// C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Web.dll#endregionusing System;using System.Runtime.InteropServices;using System.Security.Principal;using System.Text;using System.Web.Management;namespace System.Web{ // Summary: // This abstract class defines the base worker methods and enumerations used // by ASP.NET managed code to process requests.
[ComVisible(false)] public abstract class HttpWorkerRequest
{ // Summary: // Specifies the index number for the Accept HTTP header.
public const int HeaderAccept = 20; //
// Summary: // Specifies the index number for the Accept-Charset HTTP header.
public const int HeaderAcceptCharset = 21; //
// Summary: // Specifies the index number for the Accept-Encoding HTTP header.
public const int HeaderAcceptEncoding = 22; //
// Summary: // Specifies the index number for the Accept-Language HTTP header.
public const int HeaderAcceptLanguage = 23; //
// Summary: // Specifies the index number for the Accept-Ranges HTTP header.
public const int HeaderAcceptRanges = 20; //
// Summary: // Specifies the index number for the Age HTTP header.
public const int HeaderAge = 21; //
// Summary: // Specifies the index number for the Allow HTTP header.
public const int HeaderAllow = 10; //
// Summary: // Specifies the index number for the Authorization HTTP header.
public const int HeaderAuthorization = 24; //
// Summary: // The index that represents the HTTP Cache-Control HTTP header.
public const int HeaderCacheControl = 0; //
// Summary: // Specifies the index number for the Connection HTTP header.
public const int HeaderConnection = 1; //
// Summary: // Specifies the index number for the Content-Encoding HTTP header.
public const int HeaderContentEncoding = 13; //
// Summary: // Specifies the index number for the Content-Language HTTP header.
public const int HeaderContentLanguage = 14; //
// Summary: // Specifies the index number for the Content-Length HTTP header.
public const int HeaderContentLength = 11; //
// Summary: // Specifies the index number for the Content-Location HTTP header.
public const int HeaderContentLocation = 15; //
// Summary: // Specifies the index number for the Content-MD5 HTTP header.
public const int HeaderContentMd5 = 16; //
// Summary: // Specifies the index number for the Content-Range HTTP header.
public const int HeaderContentRange = 17; //
// Summary: // Specifies the index number for the Content-Type HTTP header.
public const int HeaderContentType = 12; //
// Summary: // Specifies the index number for the Cookie HTTP header.
public const int HeaderCookie = 25; //
// Summary: // Specifies the index number for the Date HTTP header.
public const int HeaderDate = 2; //
// Summary: // Specifies the index number for the ETag HTTP header.
public const int HeaderEtag = 22; //
// Summary: // Specifies the index number for the Except HTTP header.
public const int HeaderExpect = 26; //
// Summary: // Specifies the index number for the Expires HTTP header.
public const int HeaderExpires = 18; //
// Summary: // Specifies the index number for the From HTTP header.
public const int HeaderFrom = 27; //
// Summary: // Specifies the index number for the Host HTTP header.
public const int HeaderHost = 28; //
// Summary: // Specifies the index number for the If-Match HTTP header.
public const int HeaderIfMatch = 29; //
// Summary: // Specifies the index number for the If-Modified-Since HTTP header.
public const int HeaderIfModifiedSince = 30; //
// Summary: // Specifies the index number for the If-None-Match HTTP header.
public const int HeaderIfNoneMatch = 31; //
// Summary: // Specifies the index number for the If-Range HTTP header.
public const int HeaderIfRange = 32; //
// Summary: // Specifies the index number for the If-Unmodified-Since HTTP header.
public const int HeaderIfUnmodifiedSince = 33; //
// Summary: // Specifies the index number for the Keep-Alive HTTP header.
public const int HeaderKeepAlive = 3; //
// Summary: // Specifies the index number for the Last-Modified HTTP header.
public const int HeaderLastModified = 19; //
// Summary: // Specifies the index number for the Location HTTP header.
public const int HeaderLocation = 23; //
// Summary: // Specifies the index number for the Max-Forwards HTTP header.
public const int HeaderMaxForwards = 34; //
// Summary: // Specifies the index number for the Pragma HTTP header.
public const int HeaderPragma = 4; //
// Summary: // Specifies the index number for the Proxy-Authenticate HTTP header.
public const int HeaderProxyAuthenticate = 24; //
// Summary: // Specifies the index number for the Proxy-Authorization HTTP header.
public const int HeaderProxyAuthorization = 35; //
// Summary: // Specifies the index number for the Range HTTP header.
public const int HeaderRange = 37; //
// Summary: // Specifies the index number for the Referer HTTP header.
public const int HeaderReferer = 36; //
// Summary: // Specifies the index number for the Retry-After HTTP header.
public const int HeaderRetryAfter = 25; //
// Summary: // Specifies the index number for the Server HTTP header.
public const int HeaderServer = 26; //
// Summary: // Specifies the index number for the Set-Cookie HTTP header.
public const int HeaderSetCookie = 27; //
// Summary: // Specifies the index number for the TE HTTP header.
public const int HeaderTe = 38; //
// Summary: // Specifies the index number for the Trailer HTTP header.
public const int HeaderTrailer = 5; //
// Summary: // Specifies the index number for the Transfer-Encoding HTTP header.
public const int HeaderTransferEncoding = 6; //
// Summary: // Specifies the index number for the Upgrade HTTP header.
public const int HeaderUpgrade = 7; //
// Summary: // Specifies the index number for the User-Agent HTTP header.
public const int HeaderUserAgent = 39; //
// Summary: // Specifies the index number for the Vary HTTP header.
public const int HeaderVary = 28; //
// Summary: // Specifies the index number for the Via HTTP header.
public const int HeaderVia = 8; //
// Summary: // Specifies the index number for the Warning HTTP header.
public const int HeaderWarning = 9; //
// Summary: // Specifies the index number for the WWW-Authenticate HTTP header.
public const int HeaderWwwAuthenticate = 29; //
// Summary: // Specifies a reason for the request.
public const int ReasonCachePolicy = 2; //
// Summary: // Specifies a reason for the request.
public const int ReasonCacheSecurity = 3; //
// Summary: // Specifies a reason for the request.
public const int ReasonClientDisconnect = 4; //
// Summary: // Specifies a reason for the request. The default value is System.Web.HttpWorkerRequest.ReasonResponseCacheMiss.
public const int ReasonDefault = 0; //
// Summary: // Specifies a reason for the request.
public const int ReasonFileHandleCacheMiss = 1; //
// Summary: // Specifies a reason for the request.
public const int ReasonResponseCacheMiss = 0; //
// Summary: // Specifies the index number for the Maximum HTTP request header.
public const int RequestHeaderMaximum = 40; //
// Summary: // Specifies the index number for the Maximum HTTP response header.
public const int ResponseHeaderMaximum = 30; // Summary: // Initializes a new instance of the System.Web.HttpWorkerRequest class.
protected HttpWorkerRequest(); // Summary: // Gets the full physical path to the Machine.config file. //
// Returns: // The physical path to the Machine.config file.
public virtual string MachineConfigPath { get; } //
// Summary: // Gets the physical path to the directory where the ASP.NET binaries are installed. //
// Returns: // The physical directory to the ASP.NET binary files.
public virtual string MachineInstallDirectory { get; } //
// Summary: // Gets the corresponding Event Tracking for Windows trace ID for the current // request. //
// Returns: // A trace ID for the current ASP.NET request.
public virtual Guid RequestTraceIdentifier { get; } //
// Summary: // Gets the full physical path to the root Web.config file. //
// Returns: // The physical path to the root Web.config file.
public virtual string RootWebConfigPath { get; } //
// Summary: // Gets a value that indicates whether asynchronous flush operations are supported. //
// Returns: // true if asynchronous flush operations are supported; otherwise, false.
public virtual bool SupportsAsyncFlush { get; } //
// Summary: // Gets a value that indicates whether asynchronous read operations are supported. //
// Returns: // true if asynchronous read operations are supported; otherwise, false.
public virtual bool SupportsAsyncRead { get; } // Summary: // Sends the currently buffered response to the client. //
// Parameters: // callback: // The method to call when a corresponding asynchronous operation completes. //
// state: // A user-provided object that distinguishes this particular asynchronous flush // operation from other requests. //
// Returns: // The worker request buffers the status, headers, and response body until an // asynchronous flush operation is initiated. If the underlying System.Web.HttpWorkerRequest // object supports asynchronous flush and this method is called from an asynchronous // module event or asynchronous handler, the send operation is performed asynchronously. // Otherwise, the implementation performs a synchronous flush operation.
public virtual IAsyncResult BeginFlush(AsyncCallback callback, object state); //
// Summary: // Begins an asynchronous read operation of the request entity body. //
// Parameters: // buffer: // The buffer to read the data into. //
// offset: // The byte offset in the buffer at which to begin writing data. //
// count: // The maximum number of bytes to read. //
// callback: // The method to call when a corresponding asynchronous operation completes. //
// state: // A user-provided object that distinguishes this particular asynchronous read // from other requests.
public virtual IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state); //
// Summary: // Terminates the connection with the client.
public virtual void CloseConnection(); //
// Summary: // Waits for the pending asynchronous flush operation to complete. //
// Parameters: // asyncResult: // A reference to the pending asynchronous request.
public virtual void EndFlush(IAsyncResult asyncResult); //
// Summary: // Used by the runtime to notify the System.Web.HttpWorkerRequest that request // processing for the current request is complete.
public abstract void EndOfRequest(); //
// Summary: // Waits for the pending asynchronous read operation to complete. //
// Parameters: // asyncResult: // A reference to the pending asynchronous request. //
// Returns: // The number of bytes that have been read from the stream.
public virtual int EndRead(IAsyncResult asyncResult); //
// Summary: // Sends all pending response data to the client. //
// Parameters: // finalFlush: // true if this is the last time response data will be flushed; otherwise, false.
public abstract void FlushResponse(bool finalFlush); //
// Summary: // Returns the virtual path to the currently executing server application. //
// Returns: // The virtual path of the current application.
public virtual string GetAppPath(); //
// Summary: // Returns the physical path to the currently executing server application. //
// Returns: // The physical path of the current application.
public virtual string GetAppPathTranslated(); //
// Summary: // When overridden in a derived class, returns the application pool ID for the // current URL. //
// Returns: // Always returns null.
public virtual string GetAppPoolID(); //
// Summary: // Gets the number of bytes read in from the client. //
// Returns: // A Long containing the number of bytes read.
public virtual long GetBytesRead(); //
// Summary: // When overridden in a derived class, gets the certification fields (specified // in the X.509 standard) from a request issued by the client. //
// Returns: // A byte array containing the stream of the entire certificate content.
public virtual byte[] GetClientCertificate(); //
// Summary: // Gets the certificate issuer, in binary format. //
// Returns: // A byte array containing the certificate issuer expressed in binary format.
public virtual byte[] GetClientCertificateBinaryIssuer(); //
// Summary: // When overridden in a derived class, returns the System.Text.Encoding object // in which the client certificate was encoded. //
// Returns: // The certificate encoding, expressed as an integer.
public virtual int GetClientCertificateEncoding(); //
// Summary: // When overridden in a derived class, gets a PublicKey object associated with // the client certificate. //
// Returns: // A PublicKey object.
public virtual byte[] GetClientCertificatePublicKey(); //
// Summary: // When overridden in a derived class, gets the date when the certificate becomes // valid. The date varies with international settings. //
// Returns: // A System.DateTime object representing when the certificate becomes valid.
public virtual DateTime GetClientCertificateValidFrom(); //
// Summary: // Gets the certificate expiration date. //
// Returns: // A System.DateTime object representing the date that the certificate expires.
public virtual DateTime GetClientCertificateValidUntil(); //
// Summary: // When overridden in a derived class, returns the ID of the current connection. //
// Returns: // Always returns 0.
public virtual long GetConnectionID(); //
// Summary: // When overridden in a derived class, returns the virtual path to the requested // URI. //
// Returns: // The path to the requested URI.
public virtual string GetFilePath(); //
// Summary: // Returns the physical file path to the requested URI (and translates it from // virtual path to physical path: for example, "/proj1/page.aspx" to "c:\dir\page.aspx") //
// Returns: // The translated physical file path to the requested URI.
public virtual string GetFilePathTranslated(); //
// Summary: // Returns the specified member of the request header. //
// Returns: // The HTTP verb returned in the request header.
public abstract string GetHttpVerbName(); //
// Summary: // Provides access to the HTTP version of the request (for example, "HTTP/1.1"). //
// Returns: // The HTTP version returned in the request header.
public abstract string GetHttpVersion(); //
// Summary: // Returns the standard HTTP request header that corresponds to the specified // index. //
// Parameters: // index: // The index of the header. For example, the System.Web.HttpWorkerRequest.HeaderAllow // field. //
// Returns: // The HTTP request header.
public virtual string GetKnownRequestHeader(int index); //
// Summary: // Returns the index number of the specified HTTP request header. //
// Parameters: // header: // The name of the header. //
// Returns: // The index number of the HTTP request header specified in the header parameter.
public static int GetKnownRequestHeaderIndex(string header); //
// Summary: // Returns the name of the specified HTTP request header. //
// Parameters: // index: // The index number of the header. //
// Returns: // The name of the HTTP request header specified in the index parameter.
public static string GetKnownRequestHeaderName(int index); //
// Summary: // Returns the index number of the specified HTTP response header. //
// Parameters: // header: // The name of the HTTP header. //
// Returns: // The index number of the HTTP response header specified in the header parameter.
public static int GetKnownResponseHeaderIndex(string header); //
// Summary: // Returns the name of the specified HTTP response header. //
// Parameters: // index: // The index number of the header. //
// Returns: // The name of the HTTP response header specified in the index parameter.
public static string GetKnownResponseHeaderName(int index); //
// Summary: // Provides access to the specified member of the request header. //
// Returns: // The server IP address returned in the request header.
public abstract string GetLocalAddress(); //
// Summary: // Provides access to the specified member of the request header. //
// Returns: // The server port number returned in the request header.
public abstract int GetLocalPort(); //
// Summary: // Returns additional path information for a resource with a URL extension. // That is, for the path /virdir/page.html/tail, the GetPathInfo value is /tail. //
// Returns: // Additional path information for a resource.
public virtual string GetPathInfo(); //
// Summary: // Returns the portion of the HTTP request body that has already been read. //
// Returns: // The portion of the HTTP request body that has been read.
public virtual byte[] GetPreloadedEntityBody(); //
// Summary: // Gets the portion of the HTTP request body that has currently been read by // using the specified buffer data and byte offset. //
// Parameters: // buffer: // The data to read. //
// offset: // The byte offset at which to begin reading. //
// Returns: // The portion of the HTTP request body that has been read.
public virtual int GetPreloadedEntityBody(byte[] buffer, int offset); //
// Summary: // Gets the length of the portion of the HTTP request body that has currently // been read. //
// Returns: // An integer containing the length of the currently read HTTP request body.
public virtual int GetPreloadedEntityBodyLength(); //
// Summary: // When overridden in a derived class, returns the HTTP protocol (HTTP or HTTPS). //
// Returns: // HTTPS if the System.Web.HttpWorkerRequest.IsSecure() method is true, otherwise // HTTP.
public virtual string GetProtocol(); //
// Summary: // Returns the query string specified in the request URL. //
// Returns: // The request query string.
public abstract string GetQueryString(); //
// Summary: // When overridden in a derived class, returns the response query string as // an array of bytes. //
// Returns: // An array of bytes containing the response.
public virtual byte[] GetQueryStringRawBytes(); //
// Summary: // Returns the URL path contained in the request header with the query string // appended. //
// Returns: // The raw URL path of the request header.
public abstract string GetRawUrl(); //
// Summary: // Provides access to the specified member of the request header. //
// Returns: // The client's IP address.
public abstract string GetRemoteAddress(); //
// Summary: // When overridden in a derived class, returns the name of the client computer. //
// Returns: // The name of the client computer.
public virtual string GetRemoteName(); //
// Summary: // Provides access to the specified member of the request header. //
// Returns: // The client's HTTP port number.
public abstract int GetRemotePort(); //
// Summary: // When overridden in a derived class, returns the reason for the request. //
// Returns: // Reason code. The default is ReasonResponseCacheMiss.
public virtual int GetRequestReason(); //
// Summary: // When overridden in a derived class, returns the name of the local server. //
// Returns: // The name of the local server.
public virtual string GetServerName(); //
// Summary: // Returns a single server variable from a dictionary of server variables associated // with the request. //
// Parameters: // name: // The name of the requested server variable. //
// Returns: // The requested server variable.
public virtual string GetServerVariable(string name); //
// Summary: // Returns a string that describes the name of the specified HTTP status code. //
// Parameters: // code: // The HTTP status code. //
// Returns: // The status description. For example, System.Web.HttpWorkerRequest.GetStatusDescription(System.Int32) // (404) returns "Not Found".
public static string GetStatusDescription(int code); //
// Summary: // Gets the length of the entire HTTP request body. //
// Returns: // An integer containing the length of the entire HTTP request body.
public virtual int GetTotalEntityBodyLength(); //
// Summary: // Returns a nonstandard HTTP request header value. //
// Parameters: // name: // The header name. //
// Returns: // The header value.
public virtual string GetUnknownRequestHeader(string name); //
// Summary: // Get all nonstandard HTTP header name-value pairs. //
// Returns: // An array of header name-value pairs.
[CLSCompliant(false)] public virtual string[][] GetUnknownRequestHeaders(); //
// Summary: // Returns the virtual path to the requested URI. //
// Returns: // The path to the requested URI.
public abstract string GetUriPath(); //
// Summary: // When overridden in a derived class, returns the context ID of the current // connection. //
// Returns: // Always returns 0.
public virtual long GetUrlContextID(); //
// Summary: // When overridden in a derived class, returns the client's impersonation token. //
// Returns: // A value representing the client's impersonation token. The default is 0.
public virtual IntPtr GetUserToken(); //
// Summary: // Gets the impersonation token for the request virtual path. //
// Returns: // An unmanaged memory pointer for the token for the request virtual path.
public virtual IntPtr GetVirtualPathToken(); //
// Summary: // Returns a value indicating whether the request contains body data. //
// Returns: // true if the request contains body data; otherwise, false.
public bool HasEntityBody(); //
// Summary: // Returns a value indicating whether HTTP response headers have been sent to // the client for the current request. //
// Returns: // true if HTTP response headers have been sent to the client; otherwise, false.
public virtual bool HeadersSent(); //
// Summary: // Returns a value indicating whether the client connection is still active. //
// Returns: // true if the client connection is still active; otherwise, false.
public virtual bool IsClientConnected(); //
// Summary: // Returns a value indicating whether all request data is available and no further // reads from the client are required. //
// Returns: // true if all request data is available; otherwise, false.
public virtual bool IsEntireEntityBodyIsPreloaded(); //
// Summary: // Returns a value indicating whether the connection uses SSL. //
// Returns: // true if the connection is an SSL connection; otherwise, false. The default // is false.
public virtual bool IsSecure(); //
// Summary: // Returns the physical path corresponding to the specified virtual path. //
// Parameters: // virtualPath: // The virtual path. //
// Returns: // The physical path that corresponds to the virtual path specified in the virtualPath // parameter.
public virtual string MapPath(string virtualPath); //
// Summary: // Reads request data from the client (when not preloaded). //
// Parameters: // buffer: // The byte array to read data into. //
// size: // The maximum number of bytes to read. //
// Returns: // The number of bytes read.
public virtual int ReadEntityBody(byte[] buffer, int size); //
// Summary: // Reads request data from the client (when not preloaded) by using the specified // buffer to read from, byte offset, and maximum bytes. //
// Parameters: // buffer: // The byte array to read data into. //
// offset: // The byte offset at which to begin reading. //
// size: // The maximum number of bytes to read. //
// Returns: // The number of bytes read.
public virtual int ReadEntityBody(byte[] buffer, int offset, int size); //
// Summary: // Adds a Content-Length HTTP header to the response for message bodies that // are less than or equal to 2 GB. //
// Parameters: // contentLength: // The length of the response, in bytes.
public virtual void SendCalculatedContentLength(int contentLength); //
// Summary: // Adds a Content-Length HTTP header to the response for message bodies that // are greater than 2 GB. //
// Parameters: // contentLength: // The length of the response, in bytes.
public virtual void SendCalculatedContentLength(long contentLength); //
// Summary: // Adds a standard HTTP header to the response. //
// Parameters: // index: // The header index. For example, System.Web.HttpWorkerRequest.HeaderContentLength. //
// value: // The value of the header.
public abstract void SendKnownResponseHeader(int index, string value); //
// Summary: // Adds the contents of the specified file to the response and specifies the // starting position in the file and the number of bytes to send. //
// Parameters: // handle: // The handle of the file to send. //
// offset: // The starting position in the file. //
// length: // The number of bytes to send.
public abstract void SendResponseFromFile(IntPtr handle, long offset, long length); //
// Summary: // Adds the contents of the specified file to the response and specifies the // starting position in the file and the number of bytes to send. //
// Parameters: // filename: // The name of the file to send. //
// offset: // The starting position in the file. //
// length: // The number of bytes to send.
public abstract void SendResponseFromFile(string filename, long offset, long length); //
// Summary: // Adds the specified number of bytes from a byte array to the response. //
// Parameters: // data: // The byte array to send. //
// length: // The number of bytes to send, starting at the first byte.
public abstract void SendResponseFromMemory(byte[] data, int length); //
// Summary: // Adds the specified number of bytes from a block of memory to the response. //
// Parameters: // data: // An unmanaged pointer to the block of memory. //
// length: // The number of bytes to send.
public virtual void SendResponseFromMemory(IntPtr data, int length); //
// Summary: // Specifies the HTTP status code and status description of the response, such // as SendStatus(200, "Ok"). //
// Parameters: // statusCode: // The status code to send //
// statusDescription: // The status description to send.
public abstract void SendStatus(int statusCode, string statusDescription); //
// Summary: // Adds a nonstandard HTTP header to the response. //
// Parameters: // name: // The name of the header to send. //
// value: // The value of the header.
public abstract void SendUnknownResponseHeader(string name, string value); //
// Summary: // Registers for an optional notification when all the response data is sent. //
// Parameters: // callback: // The notification callback that is called when all data is sent (out-of-band). //
// extraData: // An additional parameter to the callback.
public virtual void SetEndOfSendNotification(HttpWorkerRequest.EndOfSendNotification callback, object extraData); // Summary: // Represents the method that Notifies callers when sending of the response // is complete. //
// Parameters: // wr: // The current System.Web.HttpWorkerRequest. //
// extraData: // Any additional data needed to process the request.
public delegate void EndOfSendNotification(HttpWorkerRequest wr, object extraData);
}
}
View Code
该类是一个很底层的类，主要用于asp.net服务器内部，在一些特殊情况下，可以完成一些特殊的任务，比如，上传文件时，默认情况下，asp.net会将上传的文件内容读取到服务器的内存中，然后通过控件的方式供我们使用。这种在上传小文件的时候很方便，大文件的时候，服务器内存将出现问题，导致浏览器不能将文件继续传输。浏览器将显示“The page cannot be displayed -cannot find server or dns error.”,这个错误无法在服务器端进行捕获或者处理。
借助HttpWorkerRequest的GetPreloadedEntityBody和ReadEntityBody方法，我们可以自己分块从客户端读取上传的文件内容。然后将内容保存在一个临时文件中.
SlickUpload组件，就是基于这个实现的。感兴趣的可以看看这篇文章，如何使用该组件。
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